It has been rumored since early last week, and now we can pretty much make the transaction official.

Joe Strauss of the St. Louis Post-Dispatch reports that the Cardinals will call up top pitching prospect Shelby Miller this week from Triple-A Memphis, where he went 5-1 with a dazzling 53/4 K/BB ratio and 2.89 ERA over 37 1/3 innings in August.

Miller struggled badly over the first four months of this season, but something clicked for him recently and he’s beginning to dominate again like he did at the lower levels of the Cardinals’ minor league system. He’ll pitch out of the bullpen in St. Louis, not out of the rotation where his future lies.

The 21-year-old right-hander from Houston, Texas boasts a high-90s fastball and an improving curve. He could play a big role in long relief as the Redbirds try to grap a postseason spot.

Buchholz, 33, was acquired by the Phillies from the Red Sox in December 2016, but he made only two starts before an MRI revealed he had a partial tear of his right flexor pronator mass. He underwent surgery in April and missed the rest of the season.